[2/2] wininet: HTTP_HttpAddRequestHeadersW should ignore 0-length headers

[Paul TBBle Hampson]

Fix bug 18180 and the wine_todo test case the first patch introduced.

We simply treat a 0-length header as successful and continue parsing
after it.

Updated to test for !*lpszStart instead of strlenW(lpszStart)==0.
-- 
Paul "TBBle" Hampson, Paul.Hampson at Pobox.com

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